1025661490 has 16 divisors (see below), whose sum is σ = 2109932352. Its totient is φ = 351655344.

The previous prime is 1025661479. The next prime is 1025661491. The reversal of 1025661490 is 941665201.

It is not an unprimeable number, because it can be changed into a prime (1025661491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7326084 + ... + 7326223.

It is an arithmetic number, because the mean of its divisors is an integer number (131870772).

Almost surely, 2^1025661490 is an apocalyptic number.

1025661490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1025661490 is an abundant number, since it is smaller than the sum of its proper divisors (1084270862).

1025661490 is a wasteful number, since it uses less digits than its factorization.

1025661490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14652321.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 1025661490 is about 32025.9502591258. The cubic root of 1025661490 is about 1008.4816875876.

The spelling of 1025661490 in words is "one billion, twenty-five million, six hundred sixty-one thousand, four hundred ninety".